If only I'd knew that logic operators like "and" would work with regular expressions! In my Lama book (5th edition) it is written, that they actualy DO NOT work with regexps (or something has messed up in my head :). I'll check it tomorrow, now gonna sleep).
Thank you everyone, guys!

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Re^3: Find all strings containing "a" characters, that are not followed by "b" characters.
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